here's the twist -- the man they planned to kill, 28-year-old Fikret Saric -- could end up spending more time in prison for shooting a gun at his would-be killers once he caught wind of the scheme.

The beef between Saric and the conspirators -- who according to prosecutors planned to kill everybody inside Saric's house, including his wife and kids -- was all about a backpack filled with a measly $200 in marijuana and $200 cash. WDAY TV reports that the backpack contained two ounces of pot, so it must've been some low-grade stuff.